<?php
//后台函数
include __DIR__.'/../base.php';
//随机生成数字验证码;
function str_rand(){
	$rand = "";
	$str = "0123456789";
	for ($i=0; $i < 4; $i++) { 
		$rand .= $str[mt_rand(0,strlen($str)-1)];
	}
	return $rand;
}
